To provide a non-contact type liquid level sensor having adequate durability.

This sensor is provided with a plurality of sensing elements for detection 1a-1h located in line along the liquid depth direction, a sensing element for reference 1x located adjacent to these sensing elements 1a-1h, a float 4 vertically moving along the aligned direction of these sensing elements 1a-1h depending on the liquid level F position of the above liquid, a magnet 5 placed on this float 4 vertically moving near these sensing elements 1a-1h while facing them, and a processing means measuring mobility of the float 4 from the outputs of both the sensing elements 1a-1h and the sensing element 1x.